JPS5812075B2 - Scum High Shiyutsu Souchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a scum removal device in a circular sedimentation tank.

Conventionally, a scum box was provided around the sedimentation tank, and a scum scraping plate was lowered from an arm linked to a drive shaft to scrape up the scum on the water surface to the periphery and flow into the scum box.

However, with this method, all the scum is not collected around the scum and is scattered on the water surface, and the scum that has gathered around the tank often does not enter the scum box and is scattered again, which always causes problems. It was.

In view of the above points, the present invention arranges a radial scum discharge pipe near the water surface, and takes in scum on the water surface from a lateral scum intake port provided in this pipe and discharges it to the outside of the sedimentation tank. , and a radial arm is provided at the upper end of the drive shaft located in the center of the sedimentation basin, and a scum scraping plate made of a flexible material such as rubber is provided at the bottom of this arm to collect scum on the water surface into the pipe. The scum collection effect is improved by raking the scum, and the details are as follows.

In the figure, 1 is the circular peripheral wall of the sedimentation tank, 2 is the conical bottom wall, and 3 is the hopper in the center.

Reference numeral 4 denotes a vertical drive shaft rotatably disposed in the center, the lower end of which is supported by a bearing at the center of the lower part of the hopper 3, and the upper end rotatably mounted in the center of a support frame 5 fixed at both ends on the peripheral wall 1. It is supported and driven by a drive device 6 consisting of a motor speed reducer or the like.

Reference numeral 7 denotes a cylindrical center well arranged to surround the drive shaft 4, with open upper and lower ends, and an inflow pipe 8.
The inner end of the tube is fixed to the center well 7, so that wastewater flows into the center well 7 from the inflow pipe 8.

Reference numeral 9 denotes a trough formed on the inner periphery of the peripheral wall 1, and the supernatant water that has overflowed the trough 9 is taken out from a take-out pipe (not shown).

A sludge scraping arm 10 is fixed to the lower end of the drive shaft 4, and a scraper 11 is attached to the bottom wall 2 of the arm 10.
The sludge that has settled on the top is scraped up to the hopper 3, and the sludge in the hopper 3 is pulled out by the sludge extraction pipe 12.

13.14 is a scum discharge pipe arranged in the radial direction inside and outside the center well 7, and this pipe 13.1
The lower part of 4 is connected to a scum drawing pipe 15.

Each of the pipes 13, 14 is formed with a lateral scum inlet 16, 17, the lower edge of which is approximately equal to or slightly higher than the upper edge of the trough 9.

Further, both ends of each pipe 13 and 14 are closed.

18 is a radial arm fixed to the upper end of the drive shaft 4, and a scum scraper plate 19.20 made of a flexible material such as rubber is attached to the lower part of the arm, and a pipe 13.14 is attached to the radial arm 18.
The scum scraping plates 19 and 20 are structured to bend flexibly and pass over the pipes 13 and 14.

The present invention has the above configuration, and the wastewater flowing into the center well 7 from the inflow pipe 8 is rectified, spreads radially on the bottom wall 2, and settles.

In addition, the supernatant water overflows into the trough 9, and the settled sludge is scraped up to the central hopper 3 by the scraper 11 at the bottom of the arm 10 that rotates together with the drive shaft 4 on the bottom wall 2.
It is extracted by the extraction tube 12.

In addition, scum scraping plates 19 and 20 attached to an arm 18 that rotates together with the drive shaft 4 scrape up scum floating on the water surface toward the scum intake ports 16 and 17 of the pipes 13 and 14. It is fed into the inlets 16 and 17.

The fed scum is drawn out by a scum drawing pipe 15 connected to pipes 13 and 14, and is appropriately disposed of.

In the embodiment, one scum discharge pipe 13, 14 is provided inside and outside the center well, but a plurality of these pipes 13, 14 may be arranged radially.

In the present invention, as described above, a radial scum discharge pipe is arranged near the water surface of the circular sedimentation basin, and a flexible material such as rubber is installed at the bottom of the arm at the upper end of the drive shaft installed in the center of the sedimentation basin. A scum scraping board made of a material is provided to scrape up the scum on the water surface and allow it to flow into the scum intake port provided on the scum discharge pipe, so scum on the water surface can be almost completely removed. It has the effect of keeping the water surface clean at all times, and since the scum scraping board is made of a flexible material such as rubber, when this scraping board comes into contact with the scum discharge pipe, the lower edge bends and prevents the scum discharge pipe from flowing. This is an excellent invention that has the effect of making it easy to overcome.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing an example of a sedimentation tank embodying the present invention, FIG. 2 is an enlarged cross-sectional view of the main part, and FIG. 3 is an enlarged cross-sectional view of a scum discharge pipe. 1... Peripheral wall, 2... Bottom wall, 4...
... Drive shaft, 10 ... Sludge scraping arm, 13
, 14... Scum discharge pipe, 16, 17...
... Scum intake port, 18 ... Arm, 19
,20... Scum scraping board.

Claims (1)

[Claims] 1 A circular sedimentation tank has a vertical drive shaft in the center, and a mud scraper arm installed at the lower end of the drive shaft collects the mud settled at the bottom into a hopper. It has a horizontal scum intake near the water surface,
A scum discharge pipe with a scum extraction pipe connected to the bottom thereof is arranged in the radial direction, and a scum scraping plate made of a flexible material such as rubber is attached to the bottom of the radial arm fixed to the upper end of the drive shaft. A scum discharge device characterized by: